<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区域-->
    <el-card>
      <!--警告区域-->
      <el-alert title="注意：只允许为第三级分类设置相关参数！"
                type="warning" :closable="false" show-icon>
      </el-alert>

      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader v-model="selectdKeys"
                       :options="catelist"
                       :props="cascaderProps"
                       @change="CateChanged" clearable>
          </el-cascader>
        </el-col>
      </el-row>

      <!--tab 页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand" label="属性">
              <template v-slot="scope">
                <!--循环渲染tag标签-->
                <el-tag v-for="(item, i) in scope.row.val" :key="i" closable @close="handleClose(item.id, i, scope.row)">{{item.name}}</el-tag>
                <!--输入的文本框-->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"></el-table-column>
            <el-table-column label="参数名称" prop="name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand" label="属性">
              <template v-slot="scope">
                <!--循环渲染tag标签-->
                <el-tag v-for="(item, i) in scope.row.val" :key="i" closable @close="handleClose(item.id, i, scope.row)">{{item.name}}</el-tag>
                <!--输入的文本框-->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"></el-table-column>
            <el-table-column label="参数名称" prop="name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"  @click="showEditDialog(scope.row.id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数对话框-->
    <el-dialog :title="'添加' + titleText"
               :visible.sync="addDialogVisible"
               width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="name">
          <el-input v-model="addForm.name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--修改参数对话框-->
    <el-dialog :title="'修改' + titleText"
               :visible.sync="editDialogVisible"
               width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="name">
          <el-input v-model="editForm.name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        // 商品分类列表
        catelist: [],
        // 指定级联选择器的配置对象
        cascaderProps: {
          expandTrigger: 'hover',
          value: 'id',
          label: 'name',
          children: 'children',
          checkStrictly: true
        },
        // 级联选择框双向绑定到的数组
        selectdKeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 动态参数数据
        manyTableData: [],
        // 静态属性数据
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
          name: ''
        },
        // 添加表单的验证对象
        addFormRules: {
          name: [
            { required: true, message: '请输入的参数名称', trigger: 'blur' }
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改参数的表单数据对象
        editForm: {
          name: ''
        },
        // 修改表单的验证对象
        editFormRules: {
          name: [
            { required: true, message: '请输入的参数名称', trigger: 'blur' }
          ]
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('GetCateParentList')
        if (!res.state) {
          return this.$message.error(res.text)
        }
        for (var i = 0; i < res.data.length; i++) {
          if (res.data[i].children.length !== 0) {
            for (var j = 0; j < res.data[i].children.length; j++) {
              if (res.data[i].children[j].children.length === 0) {
                delete res.data[i].children[j].children
              }
            }
          } else {
            delete res.data[i].children
          }
        }
        this.catelist = res.data
      },
      // 级联选择器选择项发生变化触发
      CateChanged() {
        this.manyTableData = []
        this.onlyTableData = []
        this.getParamsData()
      },
      // tab 页签点击事件的处理函数
      handleTabClick() {
        this.getParamsData()
      },
      // 获取参数的列表数据
      async getParamsData() {
        if (this.selectdKeys.length !== 3) {
          this.selectdKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return false
        }
        const { data: res } = await this.$http.post('GetCateParms', { cateId: this.cateId, type: this.activeName })
        if (!res.state) {
          return this.$message.error(res.text)
        }
        res.data.forEach(item => {
          // 控制按钮与文本框的切换与显示
          item.inputVisible = false
          // 文本框输入的内容
          item.inputValue = ''
        })
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      // 监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            return false
          }
          const { data: res } = await this.$http.post('AddParams', { name: this.addForm.name, type: this.activeName, cateId: this.cateId })
          if (!res.state) {
            return this.$message.error(res.text)
          }
          this.$message.success(res.text)
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮展示修改对话框
      async showEditDialog(id) {
        const { data: res } = await this.$http.get('GetParamsByID', { params: { id: id, type: this.activeName } })
        if (!res.state) {
          return this.$message.error(res.text)
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 监听添加对话框的关闭事件
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) {
            return false
          }
          const { data: res } = await this.$http.post('UpdateParams', { param: this.editForm })
          if (!res.state) {
            return this.$message.error(res.text)
          }
          this.$message.success(res.text)
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      // 点击按钮删除参数项
      async removeParams(id) {
        await this.$confirm('此操作将永久删除该参数项, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(async () => {
          const { data: res } = await this.$http.post('DeleteParans', { id })
          if (!res.state) {
            return this.$message.error(res.text)
          }
          this.$message.success(res.text)
          this.getParamsData()
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })
        })
      },
      // 文本框失去焦点或按下了Enter都会触发
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return false
        }
        const { data: res } = await this.$http.post('AddVals', { id: row.id, name: row.inputValue.trim() })
        if (!res.state) {
          return this.$message.error(res.text)
        }
        row.val.push(res.data)
        this.$message.success(res.text)
        row.inputValue = ''
        row.inputVisible = false
      },
      // 点击按钮展示文本输入框
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 删除对应的可选项
      async handleClose(id, i, row) {
        row.val.splice(i, 1)
        const { data: res } = await this.$http.post('DeleteVals', { id })
        if (!res.state) {
          return this.$message.error(res.text)
        }
        this.$message.success(res.text)
      }
    },
    computed: {
      // 如果按钮需要被禁用，则返回true，否则返回false
      isBtnDisabled() {
        if (this.selectdKeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的三级分类的id
      cateId() {
        if (this.selectdKeys.length === 3) {
          return this.selectdKeys[2]
        }
        return null
      },
      // 动态计算标题文本
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style lang="less" scoped>
  .cat_opt{
    margin: 15px 0;
  }
  .el-tag {
    margin: 0 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
